On 28.10.2021 07:34, Greg KH wrote:

On Wed, Oct 27, 2021 at 06:35:44PM -0700, Pawan Gupta wrote:

quoted

Disabling unprivileged BPF would help prevent unprivileged users from
creating the conditions required for potential speculative execution
side-channel attacks on affected hardware. A deep dive on such attacks
and mitigation is available here [1].

If an architecture selects CONFIG_CPU_SPECTRE, disable unprivileged BPF
by default. An admin can enable this at runtime, if necessary.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>

[1] https://ebpf.io/summit-2021-slides/eBPF_Summit_2021-Keynote-Daniel_Borkmann-BPF_and_Spectre.pdf

This should go above the signed-off-by line, in the changelog text, not
below it, otherwise our tools get confused when trying to apply it.

Thanks, I will fix it.